XLS To CSV Converter

What is XLS To CSV Converter?

The AIZora XLS To CSV Converter is a free browser-based tool that turns Microsoft Excel workbooks — both legacy .xls and modern .xlsx files — into clean, standards-compliant CSV files. You drag in a workbook, choose a delimiter and character encoding, and download one CSV per worksheet. No Excel licence, no desktop install, no macros, and no sign-up required.

Most people need an XLS to CSV converter because a database importer, a CRM, an ad platform, a bank portal or a Python script refuses to accept binary spreadsheets. CSV is the universal plain-text table format: every analytics tool, SQL loader and data pipeline on earth can read it. The problem is that naive conversions mangle data — leading zeros vanish, dates become five-digit serial numbers, product codes turn into scientific notation, and commas inside addresses split rows in half. This converter is built specifically to prevent all of that.

Why a dedicated converter beats Save As

Excel's own Save As → CSV only exports the active worksheet, silently applies your machine's regional list separator (semicolons in much of Europe), and writes ANSI encoding that destroys accented characters and emoji. Our XLS to CSV converter exports every sheet at once, lets you force UTF-8 or UTF-8 with BOM, and gives you explicit control over the delimiter so you can produce true comma-delimited files anywhere in the world.

How to use the XLS To CSV Converter

Conversion takes three clicks and usually finishes in under ten seconds for workbooks under a few megabytes.

• Upload — drag one or many.xls /.xlsx files onto the drop zone, or click to browse. Batch mode lets you convert multiple XLSX to CSV in a single pass.
• Configure — pick your delimiter (comma, semicolon, tab or pipe), encoding (UTF-8, UTF-8 BOM, Latin-1), date format, and whether the first row is a header.
• Choose sheets — keep every worksheet or tick only the ones you need. Each becomes its own CSV file.
• Download — grab individual CSVs or a single ZIP containing all of them, then import straight into MySQL, PostgreSQL, BigQuery, Salesforce, HubSpot or pandas.

What happens to your data during conversion

The converter normalises the messy realities of real spreadsheets:

• Formulas are resolved to their calculated values, never exported as =SUM(A1:A9).
• Dates and times become ISO 8601 (YYYY-MM-DD) by default, or any format you choose — no more 45321 appearing where a date should be.
• Leading zeros in ZIP codes, SKUs, phone numbers and account IDs are preserved as text.
• Long numeric IDs stay as digits instead of collapsing into 1.23457E+14.
• Fields containing commas, quotes or line breaks are correctly quoted and escaped per RFC 4180.
• Merged cells are unwound so each row has the same column count.
• Empty leading rows, trailing rows and blank columns are trimmed automatically.

XLS To CSV Converter vs other options

Who uses an XLS to CSV converter

Data analysts flatten client workbooks before loading them into warehouses. Developers need CSV fixtures for seeding databases and running tests. Marketers convert contact lists for ad platform audience uploads, which only accept CSV. Accountants and bookkeepers export ledger sheets for QuickBooks or Xero imports. E-commerce managers turn supplier price books into product feeds for Shopify, Amazon or WooCommerce. Researchers and students convert survey exports so R, SPSS or pandas can read them.

Tips for the cleanest possible CSV

• Pick UTF-8 with BOM if you will open the CSV in Excel afterwards — it stops accented characters and non-Latin scripts from garbling.
• Use semicolon or tab when your data is full of commas (addresses, descriptions) and the destination system supports it.
• Flatten pivot tables first — CSV has no concept of grouping, so copy pivot output into a plain sheet before converting.
• Remove totals rows so your importer does not treat a summary line as real data.
• Keep one header row with short, lowercase, underscore-separated column names for the smoothest database import.
• Split huge workbooks by sheet rather than exporting a single enormous file — most importers handle several medium CSVs better than one giant one.

Privacy and limits

Files are processed for conversion only and are not used to train models or shared with third parties. Converted output is available for download immediately and temporary copies are purged automatically. Because the XLS to CSV converter runs server-side, it works identically on Windows, macOS, Linux, ChromeOS, iPad and Android — anywhere you have a browser. For very large workbooks, convert sheet by sheet for the fastest, most reliable results.